https://docs.taskcluster.net/docs/manual/using/integration/frontend contains a tutorial that implements third-party login tutorial and allows users to execute a Taskcluster API call. This should work once bug 1561905 is resolved.
Bug 1566190 Comment 3 Edit History
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https://docs.taskcluster.net/docs/manual/using/integration/frontend contains a tutorial that implements third-party login and allows users to execute a Taskcluster API call. This should work once bug 1561905 is resolved.